Cad a dhéanann seo a rá (not sure if that is correct, is it?)

"Bíonn urú i ndiaidh "i" nuair nach bhfuil "an" ná "na" leis an ainmfhocal"

I am assuming it means when there is no "an" or "na" BEFORE the ainmfhocal??

Is that right?

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Please feel free to correct anything I say in Irish that is incorrect.
Anything in English, leave it alone, I dont care.

"before" would be roimh - leis is "with".

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Múinteoir Gaeilge - Irish Teacher
My "specialty" is Connemara Irish, particularly Cois Fhairrge dialect, but I can also speak Ulster and Munster Irish with native-level pronunciation.
Is fearr Gaeilge ḃriste ná Béarla cliste, cinnte, aċ i ḃfad níos fearr aríst í Gaeilge ḃinn ḃeo na nGaeltaċtaí.
Gaeilge Chonnacht (GC), go háraid Gaeilge Chois Fhairrge (GCF), Gaeilic Uladh (GU), Gaelainn na Mumhan (GM), agus Gaeilge an Chaighdeáin Oifigiúil (CO).

go hanna mhaith.... go raibh maith agat.

_________________
Please feel free to correct anything I say in Irish that is incorrect.
Anything in English, leave it alone, I dont care.